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Improve wrong-tuple-type error reports in contrib/tablefunc.

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These messages were fairly confusing, and didn't match the
column names used in the SGML docs.  Try to improve that.
Also use error codes more specific than ERRCODE_SYNTAX_ERROR.

Patch by me, reviewed by Joe Conway

Discussion: https://postgr.es/m/18937.1709676295@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2024-03-09 15:48:21 -05:00
parent b0289574bd
commit 76904eda25
3 changed files with 195 additions and 101 deletions
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85
contrib/tablefunc/expected/tablefunc.out
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@ -145,6 +145,23 @@ SELECT * FROM crosstab_out('SELECT rowid, attribute, val FROM ct where rowclass
| val9 | val10 | val11
(3 rows)
-- check error reporting
SELECT * FROM crosstab('SELECT rowid, val FROM ct where rowclass = ''group1'' and (attribute = ''att2'' or attribute = ''att3'') ORDER BY 1,2;')
AS ct(row_name text, category_1 text, category_2 text);
ERROR: invalid crosstab source data query
DETAIL: The query must return 3 columns: row_name, category, and value.
SELECT * FROM crosstab('SELECT rowid, attribute, val FROM ct where rowclass = ''group1'' and (attribute = ''att2'' or attribute = ''att3'') ORDER BY 1,2;')
AS ct(row_name text);
ERROR: invalid crosstab return type
DETAIL: Return row must have at least two columns.
SELECT * FROM crosstab('SELECT rowid, attribute, val FROM ct where rowclass = ''group1'' and (attribute = ''att2'' or attribute = ''att3'') ORDER BY 1,2;')
AS ct(row_name int, category_1 text, category_2 text);
ERROR: invalid crosstab return type
DETAIL: Source row_name datatype text does not match return row_name datatype integer.
SELECT * FROM crosstab('SELECT rowid, attribute, val FROM ct where rowclass = ''group1'' and (attribute = ''att2'' or attribute = ''att3'') ORDER BY 1,2;')
AS ct(row_name text, category_1 text, category_2 int);
ERROR: invalid crosstab return type
DETAIL: Source value datatype text does not match return value datatype integer in column 3.
--
-- hash based crosstab
--
@ -216,13 +233,20 @@ SELECT * FROM crosstab(
'SELECT rowid, rowdt, attribute, val FROM cth ORDER BY 1',
'SELECT DISTINCT attribute FROM cth WHERE attribute = ''a'' ORDER BY 1')
AS c(rowid text, rowdt timestamp, temperature int4, test_result text, test_startdate timestamp, volts float8);
ERROR: provided "categories" SQL must return 1 column of at least one row
ERROR: crosstab categories query must return at least one row
-- if category query generates more than one column, get expected error
SELECT * FROM crosstab(
'SELECT rowid, rowdt, attribute, val FROM cth ORDER BY 1',
'SELECT DISTINCT rowdt, attribute FROM cth ORDER BY 2')
AS c(rowid text, rowdt timestamp, temperature int4, test_result text, test_startdate timestamp, volts float8);
ERROR: provided "categories" SQL must return 1 column of at least one row
ERROR: invalid crosstab categories query
DETAIL: The query must return one column.
-- if category query generates a NULL value, get expected error
SELECT * FROM crosstab(
'SELECT rowid, rowdt, attribute, val FROM cth ORDER BY 1',
'SELECT NULL::text')
AS c(rowid text, rowdt timestamp, temperature int4, test_result text, test_startdate timestamp, volts float8);
ERROR: crosstab category value must not be null
-- if source query returns zero rows, get zero rows returned
SELECT * FROM crosstab(
'SELECT rowid, rowdt, attribute, val FROM cth WHERE false ORDER BY 1',
@ -241,6 +265,26 @@ AS c(rowid text, rowdt timestamp, temperature text, test_result text, test_start
-------+-------+-------------+-------------+----------------+-------
(0 rows)
-- check errors with inappropriate input rowtype
SELECT * FROM crosstab(
'SELECT rowid, attribute FROM cth ORDER BY 1',
'SELECT DISTINCT attribute FROM cth ORDER BY 1')
AS c(rowid text, temperature text, test_result text, test_startdate text, volts text);
ERROR: invalid crosstab source data query
DETAIL: The query must return at least 3 columns: row_name, category, and value.
SELECT * FROM crosstab(
'SELECT rowid, rowdt, rowdt, attribute, val FROM cth ORDER BY 1',
'SELECT DISTINCT attribute FROM cth ORDER BY 1')
AS c(rowid text, rowdt timestamp, temperature int4, test_result text, test_startdate timestamp, volts float8);
ERROR: invalid crosstab return type
DETAIL: Return row must have 7 columns, not 6.
-- check errors with inappropriate result rowtype
SELECT * FROM crosstab(
'SELECT rowid, attribute, val FROM cth ORDER BY 1',
'SELECT DISTINCT attribute FROM cth ORDER BY 1')
AS c(rowid text);
ERROR: invalid crosstab return type
DETAIL: Return row must have at least two columns.
-- check it works with a named result rowtype
create type my_crosstab_result as (
rowid text, rowdt timestamp,
@ -381,17 +425,42 @@ SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 4, '~') A
-- should fail as first two columns must have the same type
SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 0, '~') AS t(keyid text, parent_keyid int, level int, branch text);
ERROR: invalid return type
DETAIL: First two columns must be the same type.
ERROR: invalid connectby return type
DETAIL: Source key type integer does not match return key type text.
-- should fail as key field datatype should match return datatype
SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 0, '~') AS t(keyid float8, parent_keyid float8, level int, branch text);
ERROR: invalid return type
DETAIL: SQL key field type double precision does not match return key field type integer.
ERROR: invalid connectby return type
DETAIL: Source key type integer does not match return key type double precision.
SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 0, '~') AS t(keyid int, parent_keyid float8, level int, branch text);
ERROR: invalid connectby return type
DETAIL: Source parent key type integer does not match return parent key type double precision.
-- check other rowtype mismatch cases
SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 0) AS t(keyid int, parent_keyid int, level int, branch text);
ERROR: invalid connectby return type
DETAIL: Return row must have 3 columns, not 4.
SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 0, '~') AS t(keyid int, parent_keyid int, level int);
ERROR: invalid connectby return type
DETAIL: Return row must have 4 columns, not 3.
SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 0) AS t(keyid int, parent_keyid text, level int);
ERROR: invalid connectby return type
DETAIL: Source parent key type integer does not match return parent key type text.
SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 0, '~') AS t(keyid int, parent_keyid int, level float, branch float);
ERROR: invalid connectby return type
DETAIL: Third return column (depth) must be type integer.
SELECT * FROM connectby('connectby_int', 'keyid', 'parent_keyid', '2', 0, '~') AS t(keyid int, parent_keyid int, level int, branch float);
ERROR: invalid connectby return type
DETAIL: Fourth return column (branch) must be type text.
SELECT * FROM connectby('connectby_text', 'keyid', 'parent_keyid', 'pos', 'row2', 0, '~') AS t(keyid text, parent_keyid text, level int, branch text, pos text);
ERROR: invalid connectby return type
DETAIL: Fifth return column (serial) must be type integer.
SELECT * FROM connectby('connectby_text', 'keyid', 'parent_keyid', 'pos', 'row2', 0) AS t(keyid text, parent_keyid text, level int, pos text);
ERROR: invalid connectby return type
DETAIL: Fourth return column (serial) must be type integer.
-- tests for values using custom queries
-- query with one column - failed
SELECT * FROM connectby('connectby_int', '1; --', 'parent_keyid', '2', 0) AS t(keyid int, parent_keyid int, level int);
ERROR: invalid return type
DETAIL: Query must return at least two columns.
ERROR: invalid connectby source data query
DETAIL: The query must return at least two columns.
-- query with two columns first value as NULL
SELECT * FROM connectby('connectby_int', 'NULL::int, 1::int; --', 'parent_keyid', '2', 0) AS t(keyid int, parent_keyid int, level int);
keyid | parent_keyid | level